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On leave of absence from Institute of Physics, Padova.
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Calvani, M., de Felice, F. & Nobili, L. Are naked singularities really visible?. Lett. Nuovo Cimento 23, 539–542 (1978). https://doi.org/10.1007/BF02770540
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DOI: https://doi.org/10.1007/BF02770540